Modern UI for WPF

•    WPF

A set of controls and styles converting your WPF application into a great looking Modern UI app. Modern UI for WPF is a spin-off of XAML Spy.

MahApps.Metro - A toolkit for creating Metro / Modern UI styled WPF apps.

•    CSharp

A toolkit for creating metro-style WPF applications. Lots of goodness out-of-the box.This framework is free and can be used for free, open source and commercial applications. It's tested and contributed by many people... So mainly hit the ⭐️ button, that's all... thx (💵, 💶, 🍺 or some other gifts are also being accepted...).

Metro-UI-CSS - Build responsive, mobile-first projects on the web with the first front-end component library in Metro Style

•    CSS

Metro 4 is an MIT-licensed open source project. It's an independent project with its ongoing development made possible entirely thanks to the support by these awesome Backers. Documentation and Demo for v4: getmetroui.com or metroui.org.ua.

Player Framework by Microsoft

•    Silverlight

An open source, robust video player framework for Windows 8, HTML5, Silverlight, Windows Phone and other application platforms.

Mosaic Project

Mosaic makes life easier for all technology enthusiasts and all users that love the MetroUI. Trough Mosaic you no longer have to seek trough dozens of applications to find your information as it displays all your info at one glance. Mosaic is developed in C#

Silverlight Metro Theme

•    Silverlight

Metro Theme for Silverlight.

Cosmopolitan Theme for WPF

•    WPF

This project contains the Silverlight Cosmopolitan theme ported to WPF

Google Advance Search

An easy way to create documents search at Google and read your emails and Much more

Codename Chrometro

Discontinued.

MetroContractSample

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SharePoint 2010 Metro UI

Need a Windows 8 Metro style UI landing page? SharePoint 2010 Metro Masterpage and Css!

Okra App Framework

The Okra App Framework supports the development of Windows Store applications, in particular those implementing the MVVM pattern.

Metro Toolkit

•    WPF

MetroToolkit is open source project, a place where we can share new components and functionality for designers, developers, and the community to provide an efficient way to help shape product development in Metro inspired applications based on the Metro UI Design Guidelines.

patterns & practices - Develop Windows Store apps using C++ & XAML: Hilo

•    C++

Hilo guides you though the development of a Windows Store app. The Hilo sample is a photo viewing app using C++ and XAML.

Mishra Reader

MishraReader is a Google Reader client developed using WPF with focus on ergonomy and smooth animations.

Windows 8 Minesweeper

•    Javascript

A minesweeper clone in the Windows 8 Metro style, developed in JavaScript and HTML5.

bwNotepad for Metro

a simple notepad for Win8 Metro

Windows 8 Toolkit - Charts and More

I'm trying to Build a Charting Control Set for Windows 8 Modern UI I already Built a Pie Chart which is available now on http://blogs.msdn.com/b/mertoapps

JulMar MVVM Helpers + Behaviors

•    WPF

The MVVM Helper + Behavior library is a set of classes for WPF developers to help them build Model-View-ViewModel oriented applications. It includes some useful WPF classes, a base framework for MVVM and a bunch of Blend behaviors, triggers and actions.

SharePoint Metro Grid

SharePoint 2010/2013 web part that displays links in Metro Tile Grid format. Just like Windows 8. Includes 215 images in 7 different sizes. Or use your own.